basic knowledge on oops

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C#

C#4.0

hello friends,
In my educational period i was study about what is oops(object, class,inheritance,polymorphism,encapsulation and etc) as a theory with simple example,but after now a days i need to create my own classes,but still i am confused at this level,please tell me which way is better to understand and coding with my own way.please refer me any best articles for these topics